LA75501V

PS No.A0224-10/10

S7.S8. PAL, NT de-emphasis [Pdeem, Ndeem]

(1) External AGC (V18 = VCC)

(2) fs = 5.5MHz fm = 3kHz

∆F = ±30kHz

(SIF input Vi = 31.6mVrms)

(3) Open system switches (A (pin 13) and B (pin 14)). (BG mode)

(4) Measure the FM detector output voltage at test point D. ····· Vp

(5) Calculate as follows:

Pdeem (dB) = Vp

− VO (FM)

(6) fs = 4.5MHz fm = 2kHz

∆F = ±30kHz

(SIF input Vi = 31.6mVrms)

(7) Set system switches [A (pin 13) and B (pin 14)] to GND. (NT mode)

(8) Measure the FM detector output voltage at test point D. ····· Vp

(9) Calculate as follows:

Ndeem (dB) = Vnt

− VO (FM)

S9. PAL/NT Audio voltage gain difference [GD]

(1) External AGC (V18 =VCC)

(2) fs = 4.5MHz fm = 400Hz

∆F = ±30kHz

(SIF input Vi = 31.6mVrms)

(3) Set system switches [A (pin 13) and B (pin 14)] to GND.

(4) Measure the FM detector output voltage at test point D. ····· Vnt

(5) Calculate as follows:

GD (db) = Vnt

− VO (FM)

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